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Air She buy's $\displaystyle 100$ shares at $$\displaystyle 15$ so in total she pays:
$\displaystyle 100 \times$ $$\displaystyle 15 = $ $$\displaystyle 1500$
In $\displaystyle 2$ years, the value is $$\displaystyle 20$ so in total, her share value is:
$\displaystyle 100 \times$ $$\displaystyle 20 = $ $$\displaystyle 2000$
So, over two years, she has had a profit as the stocks are worth more than she paid so she has earnt:
$$\displaystyle 2000 -$ $$\displaystyle 1500 = $ $$\displaystyle 500$
So, per annum ($\displaystyle 1$ year) this would be:
$$\displaystyle 500 \div 2 = ...$